Do not pretend to be the site owner?
If you see this on the third step during initial setup ...
It is because we need to verify if you are really you before saving the actual tokens into your database. If you see this, then the email you defined in
userPrincipalName is wrong.
You must configure this email to be exactly the same as the one you use to log into your Microsoft account during the second step of OAuth. Check for typos, domain names, and incorrect capitalisations. Must be exactly the same! 😡